Mail Archives: cygwin/2013/01/20/17:09:23
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| Message-ID: | <50FC6AF2.7070501@coverity.com>
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| Date: | Sun, 20 Jan 2013 17:08:50 -0500
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| From: | Tom Honermann <thonermann AT coverity DOT com>
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| To: | <cygwin AT cygwin DOT com>
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| Subject: | Re: Intermittent failures with ctrl-c
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On 01/19/2013 12:58 AM, Christopher Faylor wrote:
> On Fri, Jan 18, 2013 at 03:11:03PM -0500, Tom Honermann wrote:
>> On 01/16/2013 05:23 PM, Christopher Faylor wrote:
>>> On Wed, Jan 16, 2013 at 03:18:47PM -0500, Tom Honermann wrote:
>>> I managed to duplicate a hang by changing your .bat file to use "sleep
>>> 2" rather than false. I'm investigating now.
>>
>> I noticed that you checked in some additional changes on the 16th that
>> look related to this, so I tested again with today's snapshot (20130118).
>
> I thought I sent a "try a snapshot" but I must have been hallucinating
> again.
>
>> I was still able to produce hangs using the same test case. The
>> symptoms are slightly different than I had seen previously. bash hung 2
>> out of the ~60 times I interrupted the test. No error messages were
>> displayed this time. Upon pressing ctrl-c, bash hung for 60 seconds. I
>> was then greeted with the "Terminate batch job" prompt and responding
>> 'Y' terminated the process tree as expected. Pressing ctrl-c while bash
>> was hung for that 60 seconds appeared to have no affect.
>
> The hang should be fixed in the upcoming snapshot.
Snapshot 20130119 appears to have addressed most of the cases I've
witnessed.
However, I was still able to reproduce another case. As before, one of
the processes is being left running when the rest are terminated. The
"abandoned" process appears to be in a live-lock state with two threads
(threads 1 and 2) running at 100%. Of particular interest is that each
time I press ctrl-c in the cmd.exe console this process was spawned
from, a new thread appears in the process even though this program is no
longer a foreground process and all other Cygwin processes have
terminated. The new threads never exit.
Same test case as before. However, since reproducing this may be
challenging, I dug in to try and get some details that might help with
reproducing it.
It looks like thread 1 was interrupted while in a call to free(). Both
thread 1 and 2 appear to be stuck looping on calls to yield(). Thread 3
appears to be stuck in a call to WriteFile. I suspect thread 3 was
created by the initial ctrl-c event, but I'm not able to get an accurate
stack trace for this thread to prove that. Threads 4 and up correspond
to new threads created for new ctrl-c events.
The following stack traces correspond to the above mentioned snapshot
with cygwin1.dbg (from cygwin1-20130119.dbg.bz2) in place.
(gdb) thread 1
[Switching to thread 1 (Thread 5344.0x1878)]
#0 0x7767fbfa in ntdll!RtlUpdateClonedSRWLock () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
(gdb) bt
#0 0x7767fbfa in ntdll!RtlUpdateClonedSRWLock () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#1 0x7767fbfa in ntdll!RtlUpdateClonedSRWLock () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#2 0x76792ed6 in KERNELBASE!GetThreadUILanguage ()
from /cygdrive/c/Windows/syswow64/KERNELBASE.dll
#3 0x61087581 in yield ()
at
/netrel/src/cygwin-snapshot-20130119-1/winsup/cygwin/miscfuncs.cc:243
#4 0x610d6d9c in _sigfe () from
/home/thonermann/cygwin/snapshot/usr/bin/cygwin1.dll
#5 0x61083180 in free ()
at
/netrel/src/cygwin-snapshot-20130119-1/winsup/cygwin/malloc_wrapper.cc:43
#6 0x00000010 in ?? ()
#7 0x00000000 in ?? ()
(gdb) thread 2
[Switching to thread 2 (Thread 5344.0x1ac8)]
#0 0x7767f99e in ntdll!RtlUpdateClonedSRWLock () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
(gdb) bt
#0 0x7767f99e in ntdll!RtlUpdateClonedSRWLock () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#1 0x7767f99e in ntdll!RtlUpdateClonedSRWLock () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#2 0x76793a5e in SetThreadPriority () from
/cygdrive/c/Windows/syswow64/KERNELBASE.dll
#3 0x6108759b in yield ()
at
/netrel/src/cygwin-snapshot-20130119-1/winsup/cygwin/miscfuncs.cc:244
#4 0x610d6eb4 in _cygtls::lock() () from
/home/thonermann/cygwin/snapshot/usr/bin/cygwin1.dll
#5 0x610302ee in sigpacket::setup_handler (this=0x95ac04,
handler=0x6102fdc0 <signal_exit(int, siginfo_t*)>, siga=...,
tls=0x28ce64)
at
/netrel/src/cygwin-snapshot-20130119-1/winsup/cygwin/exceptions.cc:796
#6 0x610319d8 in sigpacket::process (this=0x95ac04)
at
/netrel/src/cygwin-snapshot-20130119-1/winsup/cygwin/exceptions.cc:1266
#7 0x610dd2ac in wait_sig ()
at /netrel/src/cygwin-snapshot-20130119-1/winsup/cygwin/sigproc.cc:1389
#8 0x61003ea5 in cygthread::callfunc (this=0x6118b400,
issimplestub=<optimized out>)
at /netrel/src/cygwin-snapshot-20130119-1/winsup/cygwin/cygthread.cc:51
#9 0x6100442f in cygthread::stub (arg=0x6118b400)
at /netrel/src/cygwin-snapshot-20130119-1/winsup/cygwin/cygthread.cc:93
#10 0x6100538d in _cygtls::call2 (this=<optimized out>,
func=0x610043e0 <cygthread::stub(void*)>, arg=0x6118b400,
buf=0x6100551b <_cygtls::call(unsigned long (*)(void*, void*),
void*)+91>)
at /netrel/src/cygwin-snapshot-20130119-1/winsup/cygwin/cygtls.cc:99
#11 0x0095ff88 in ?? ()
#12 0x76a8339a in KERNEL32!BaseCleanupAppcompatCacheSupport ()
from /cygdrive/c/Windows/syswow64/kernel32.dll
#13 0x6118b400 in cygthread::exiting ()
from /home/thonermann/cygwin/snapshot/usr/bin/cygwin1.dll
#14 0x0095ffd4 in ?? ()
#15 0x77699ef2 in ntdll!RtlpNtSetValueKey () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#16 0x6118b400 in cygthread::exiting ()
from /home/thonermann/cygwin/snapshot/usr/bin/cygwin1.dll
#17 0x4449ca2d in ?? ()
#18 0x00000000 in ?? ()
(gdb) thread 3
[Switching to thread 3 (Thread 5344.0x1c2c)]
#0 0x7767f91d in ntdll!RtlUpdateClonedSRWLock () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
(gdb) bt
#0 0x7767f91d in ntdll!RtlUpdateClonedSRWLock () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#1 0x7767f91d in ntdll!RtlUpdateClonedSRWLock () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#2 0x7678d4b5 in WriteFile () from
/cygdrive/c/Windows/syswow64/KERNELBASE.dll
#3 0x0000009c in ?? ()
#4 0x00000000 in ?? ()
(gdb) thread 4
[Switching to thread 4 (Thread 5344.0x718)]
#0 0x7767f8b1 in ntdll!RtlUpdateClonedSRWLock () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
(gdb) bt
#0 0x7767f8b1 in ntdll!RtlUpdateClonedSRWLock () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#1 0x7767f8b1 in ntdll!RtlUpdateClonedSRWLock () from
/cygdrive/c/Windows/SysWOW64/ntdll.dll
#2 0x76790a91 in WaitForSingleObjectEx () from
/cygdrive/c/Windows/syswow64/KERNELBASE.dll
#3 0x00000034 in ?? ()
#4 0x00000000 in ?? ()
Tom.
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